Calculation of the natural radiative lifetime of the 6snf 3 F 2 Rydberg series of barium spectrum

Ewiss, M. A. Zaki; Al-Ahdali, Issam H.

doi:10.1007/bf02532282

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…Experimental measurements of radiative lifetimes for some even-parity levels [13][14][15][16][17][18][19][20][21] and calculations for the 6snf 3 F 2 (11 n 35) Rydberg series and some 6s6p, 6s7p, 5d5p, and 5d6p levels [22,23] have been reported. But because it is difficult or impossible to excite most of the high-lying odd-parity levels from the ground level 1 S 0 and because the lowest metastable levels 6s5d 3 D J (J = 1 to 3) located above 9000 cm −1 are difficult to populate in a thermal atomic beam, direct lifetime measurements for such levels are scarce.…”

Section: Introductionmentioning

confidence: 99%

Radiative-lifetime measurements and calculations of odd-parity highly excited levels in Ba i

et al. 2010

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Natural radiative lifetime measurements have been performed for 70 odd-parity highly excited levels of neutral barium in the energy range from 308 15.512 to 417 59.93 cm −1 by a time-resolved laser-induced fluorescence technique in a laser-produced plasma. The lifetime values measured in this paper are in the range from 11.3 to 901 ns. They are compared with the published lifetimes of four levels. Two of them are in good agreement, whereas for the other two our measurements are slightly longer than the published data. The reasons for the discrepancies are discussed. Comparisons with theoretical results of the Hartree-Fock method with relativistic corrections illustrate the difficulties associated with the use of Cowan's codes for obtaining accurate branching fractions for transitions depopulating highly excited levels along the Rydberg series of heavy neutral elements. This work will be useful to extend the set of oscillator strengths available in Ba I.

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Section: Introductionmentioning

confidence: 99%

Radiative-lifetime measurements and calculations of odd-parity highly excited levels in Ba i

et al. 2010

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Total electron scattering cross sections of He, Ne and Ar, in the energy range 4 eV 2 keV

Baek¹,

Großwendt²

2003

J. Phys. B: At. Mol. Opt. Phys.

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Total scattering cross sections of the rare gases He, Ne and Ar have been measured, for electrons in the energy range from 4 eV to 2 keV. The measurements were performed using a linear transmission device and an electron energy analyser, with an angular resolution better than 1.1 × 10−3 sr and with an energy resolution far below the first excitation threshold in the three atoms. The uncertainties of the experimental results are generally smaller than 3%. With a few exceptions, the present results are in good agreement with the data of other authors. Systematic deviations were found between the present results and the data available for the total scattering cross sections of He at high electron energies. The deviations increase with increasing energy and reach about 13% at 2 keV. It appears that different levels of the separation of forward-scattered electrons are responsible for these systematic deviations.

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Calculation of the natural radiative lifetime of the 6snf 3 F 2 Rydberg series of barium spectrum

Cited by 2 publications

References 14 publications

Radiative-lifetime measurements and calculations of odd-parity highly excited levels in Ba i

Radiative-lifetime measurements and calculations of odd-parity highly excited levels in Ba i

Total electron scattering cross sections of He, Ne and Ar, in the energy range 4 eV 2 keV

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